OMG, not yet another BB issue/question.

It's been suggested to me that I don't need to have a wave washer on GXP BB90 drive side between bearing dust cap and spider.
If the wavy washer is removed and the crank set is installed/torqued there is in fact a slight gap between the drive side bearing cap and the back side of the sprocket/spider.

In general this seems fine and preferable, however, it seems to me that over time, considering the way GXP clamps the crank to both sides of the non drive side bearing, that the crank set will eventually begin to push
the NDS bearing out of it's cup. Especially when cranking very hard on climbs. Essentially moving the entire crank set over thus changing the chain line etc.

Even if the NDS bearing was very tightly pressed in and/or retaining compound used, the tendency would be that the NDS bearing would be pushed out by the distance between the spider and the drive side bearing cover.

I seem to find varying info around... e.g. "yes, wave washer is needed", "no, wave washer is not needed".

I was curious if anyone may have first hand experience with this... THANKS!